/*

lab.nvim
Copyright: (c) 2022, Dan Peterson <hi@dan-peterson.ca>

This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.

This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
GNU General Public License for more details.

You should have received a copy of the GNU General Public License
along with this program.  If not, see <https://www.gnu.org/licenses/>.

*/

import type { DebuggerMessageHandler } from '@/runners/node/types.js';

interface PreviewProp {
	type: string,
	name: string,
	value: unknown,
}

type PreviewProps = Array<PreviewProp>;

const objPreview = {
	output: '',
	wrap(type: 'array'|'object') {
		this.output = (type === 'array') ? `[ ${this.trim(this.output)} ]` :  `{ ${this.trim(this.output)} }`;
		return this;
	},
	trim(str: string): string {
		return str.slice(0, -2);
	},
	formatValue(item: PreviewProp){
		switch (item.type) {
			case 'function':
				return '';
			case 'string':
				return `"${item.value}"`;
			default:
				return item.value;
		}
	},
	format(data: PreviewProps) {
		this.output = data.reduce((a, c) => {
			return `${a}${c.name}: ${this.formatValue(c)}, `;
		}, '');
		return this;
	},
};

export const consoleHandler: DebuggerMessageHandler = (message) => {
	
	const frame = message.params.stackTrace.callFrames.find(frame => frame.url === `file://${message.__file}`);
	if (!frame) return null;
	
	const preview = message.params.args.reduce((preview, arg) => {
		switch (arg.type) {
			case 'function':
			case 'symbol':
				return `${preview} ${arg.description}`;
			case 'object': {
				switch (arg.subtype) {
					case 'null':
						return `${preview} null`;
					case 'array':
						return objPreview.format(arg.preview.properties).wrap('array').output;
					default:
						return objPreview.format(arg.preview.properties).wrap('object').output;
				}
			}
			default:
				return `${preview}${arg.value}`;
		}
	}, '');

	return {
		event: 'log',
		type: message.params.type,
		line: frame.lineNumber,
		col: frame.columnNumber,
		text: preview,
	};
};